JP7029009B1 - heatsink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink capable of exhibiting excellent heat dissipation characteristics by increasing the fin area of heat dissipation fins while preventing a decrease in heat dissipation efficiency of heat dissipation fins. SOLUTION: A heat sink 1 has a container 10 having a first surface 21 and a second surface 22 facing the first surface, in which a cavity portion 13 is formed therein, and a working fluid enclosed in the cavity portion. And a steam flow path 15 provided in the cavity through which the working fluid of the gas phase flows. The first surface has a flat surface portion and a convex portion protruding outward from the flat surface portion, so that the container has a flat surface portion and a convex portion 16 protruding outward from the flat surface portion, and the convex portion of the container. The hollow portion is formed by communicating the internal space with the internal space of the flat surface portion. Of the first surface, the first heat radiation fin 41 is provided on the outer surface of the flat surface portion, and the second heat radiation fin 43 is provided on the outer surface of the second surface. [Selection diagram] Fig. 1

Description

The present invention relates to a heat sink that exhibits excellent cooling characteristics by having excellent heat dissipation fin efficiency.

The amount of heat generated by electronic components such as semiconductor elements mounted on electrical and electronic devices has increased due to high-density mounting due to higher functionality, and cooling thereof has become more important in recent years. As a method for cooling a heating element such as an electronic component, a heat sink provided with heat dissipation fins in a vapor chamber may be used.

The vapor chamber is a steam flow path provided in the hollow portion through which a flat container having a hollow portion formed inside, a working fluid enclosed in the hollow portion of the flat container, and the working fluid of the gas phase flow. It is a heat transport member provided with. The cavity of the vapor chamber is a closed space that has been decompressed. The heat transfer function of the vapor chamber transports heat from the heating element thermally connected to the vapor chamber throughout the vapor chamber, and the heat transferred to the entire vapor chamber is thermally connected to the outer surface of the vapor chamber. The heating element is cooled by conducting heat to the heat radiating fins and radiating heat from the heat radiating fins to the external environment.

Since the amount of heat generated by a heating element such as a semiconductor element, which is the object of cooling the heat sink, is increasing more and more, in order to efficiently cool the heating element having a high calorific value, for example, the heat taken from the heating element is diffused. A heat diffusion unit and a heat transport unit that is laminated in the thickness direction of the heat diffusion unit and transports heat diffused by the heat diffusion unit are provided, and the heat diffusion unit faces the upper plate and the upper plate. The lower plate is provided with an internal space capable of enclosing a refrigerant formed by laminating the upper plate and the lower plate, and the heat transport unit includes an upper plate and a lower plate facing the upper plate. , A cooling device provided with an internal space capable of enclosing a refrigerant formed by laminating the upper plate and the lower plate has been proposed (Patent Document 1). Patent Document 1 is a device for efficiently cooling a heating element having a high calorific value by forming a laminated structure of a vapor chamber having a heat diffusion function and a vapor chamber having a heat transport function.

However, in Patent Document 1, since the vapor chamber having a heat transport function is thermally connected to the vapor chamber having a heat diffusion function, the vapor chamber having a heat diffusion function and the vapor having a heat transport function are thermally connected. Since thermal resistance is generated between the room and the chamber, there is a need for improvement in terms of efficiently cooling the heating element having a high calorific value.

On the other hand, in order to cool a heating element having a high calorific value, it has been proposed to increase the fin area of the heat radiating fins thermally connected to the outer surface of the vapor chamber to improve the heat radiating characteristics of the heat radiating fins. .. However, if the fin area of the heat dissipation fins is increased, there may be a region of the heat dissipation fins that contributes to heat dissipation and a region that does not sufficiently contribute to heat dissipation, and the heat dissipation efficiency of the heat dissipation fins may decrease. was there. That is, even if the volume of the heat sink as a whole is increased by increasing the fin area of the heat radiation fins, there is a problem that the heat dissipation characteristics of the heat sink cannot be sufficiently improved.

Japanese Unexamined Patent Publication No. 2010-212623

In view of the above circumstances, it is an object of the present invention to provide a heat sink capable of exhibiting excellent heat dissipation characteristics by increasing the fin area of the heat dissipation fins while preventing a decrease in heat dissipation efficiency of the heat dissipation fins.

The gist of the structure of the present invention is as follows.
[1] A container having a first surface formed inside and a second surface facing the first surface, a working fluid enclosed in the cavity, and the operation of the vapor phase. It is equipped with a steam flow path provided in the cavity through which the fluid flows.
The first surface has a flat surface portion and a convex portion protruding outward from the flat surface portion, whereby the container has a flat surface portion and a convex portion protruding outward from the flat surface portion.
The hollow portion is formed by communicating the internal space of the convex portion of the container with the internal space of the flat surface portion.
A heat sink in which a first heat radiation fin is provided on the outer surface of the flat surface portion of the first surface, and a second heat radiation fin is provided on the outer surface of the second surface.
[2] A container having a first surface formed inside the cavity and having a second surface facing the first surface, a working fluid enclosed in the cavity, and the operation of the vapor phase. It is equipped with a steam flow path provided in the cavity through which the fluid flows.
The first surface has a flat surface portion and a convex portion protruding outward from the flat surface portion, and the second surface has a flat surface portion and a convex portion protruding outward from the flat surface portion. , The container has a flat surface portion and a convex portion protruding outward from the flat surface portion.
The hollow portion is formed by communicating the internal space of the convex portion of the container with the internal space of the flat surface portion.
A heat sink in which a first heat radiation fin is provided on the outer surface of the flat surface portion of the first surface, and a second heat radiation fin is provided on the outer surface of the flat surface portion of the second surface.
[3] The container is formed by one plate-shaped body and the other plate-shaped body facing the one plate-shaped body, and the one plate-shaped body has a convex portion protruding outward [3]. 1] The heat sink according to the above.
[4] The container is formed by one plate-shaped body and the other plate-shaped body facing the one plate-shaped body, and the one plate-shaped body and the other plate-shaped body are outwardly oriented. The heat sink according to [2], which has a protruding protrusion.
[5] Of [1] to [4], the convex portion has a heat receiving portion to which a heating element to be cooled is thermally connected, and a heat radiating fin is not provided at the tip of the convex portion. The heat sink described in any one.
[6] The heat sink according to any one of [1] to [5], wherein the convex portion has a stepped portion, and a third heat radiation fin is further provided on the outer surface of the stepped portion.
[7] The side surface of the convex portion has an inclined portion whose width becomes narrower toward the tip of the convex portion, and a fourth heat radiating fin is further provided on the outer surface of the inclined portion [1] to. The heat sink according to any one of [6].
[8] The heat sink according to any one of [1] to [7], wherein the convex portion is provided once.
[9] The heat sink according to any one of [1] to [7], wherein the convex portions are provided in a plurality.
[10] The heat sink according to any one of [1] to [9], wherein a step is provided on a flat surface portion of the container.

According to the aspect of the heat sink of the present invention, the first surface of the container has a flat surface portion and a convex portion protruding outward from the flat surface portion, so that the container protrudes outward from the flat surface portion and the flat surface portion. The first heat radiating fin is provided on the outer surface of the flat surface portion of the first surface, and the second heat radiating fin is provided on the second surface, thereby radiating heat. Since the fin area of the heat dissipation fins can be increased while preventing the fins from deteriorating the heat dissipation efficiency, excellent heat dissipation characteristics can be exhibited. That is, according to the aspect of the heat sink of the present invention, since the heat dissipation fins are thermally connected to the container in a manner divided into the first heat dissipation fins and the second heat dissipation fins, the fin area of the heat dissipation fins is increased. Even if it is increased, it is possible to prevent the generation of a region that cannot sufficiently contribute to heat dissipation and prevent a decrease in heat dissipation efficiency of the heat dissipation fins.

Further, according to the aspect of the heat sink of the present invention, the hollow portion of the container is formed by communicating the internal space of the convex portion of the container with the internal space of the flat surface portion of the container. Since the thermal resistance between the flat surface portion and the convex portion can be prevented, the heating element having a high calorific value can be efficiently cooled.

According to the aspect of the heat sink of the present invention, the first surface has a flat surface portion and a convex portion protruding outward from the flat surface portion depending on the environment in which the heat sink is installed, the arrangement of the heating element, and the like. The surface has a flat surface portion and a convex portion protruding outward from the flat surface portion, so that the container has a flat surface portion and a convex portion protruding outward from the flat surface portion, and the first surface thereof. Since the first heat radiation fin is provided on the outer surface of the flat surface portion and the second heat radiation fin is provided on the outer surface of the flat surface portion of the second surface, the heating element can be generated. It has an excellent degree of freedom in design according to the arrangement of the floors.

That is, according to the aspect of the heat sink of the present invention, the heat radiation fin is divided into a first heat radiation fin and a second heat radiation fin while having a degree of freedom in design according to the arrangement of the heating element and the like. Since it is thermally connected to the container, even if the fin area of the heat dissipation fin is increased, it is possible to prevent the generation of a region that cannot sufficiently contribute to heat dissipation and prevent the heat dissipation efficiency of the heat dissipation fin from deteriorating.

According to the aspect of the heat sink of the present invention, the convex portion has a stepped portion, and the outer surface of the stepped portion is further provided with the third heat radiation fin, so that the convex portion is connected to the container while having the convex portion. Since the number of heat-dissipating fins can be further increased, the heat-dissipating characteristics are further improved.

According to the aspect of the heat sink of the present invention, the side surface of the convex portion has an inclined portion whose width becomes narrower toward the tip of the convex portion, and a fourth heat radiation fin is further provided on the outer surface of the inclined portion. As a result, the number of heat-dissipating fins connected to the container while having the convex portion can be further increased, so that the heat-dissipating characteristics are further improved.

It is a side view explaining the outline of the heat sink which concerns on 1st Embodiment of this invention. It is a side view explaining the outline of the heat sink which concerns on 2nd Embodiment of this invention. It is a side view explaining the outline of the heat sink which concerns on 3rd Embodiment of this invention. It is a side view explaining the outline of the heat sink which concerns on 4th Embodiment of this invention. It is a side view explaining the outline of the heat sink which concerns on 5th Embodiment of this invention. It is a side view explaining the outline of the heat sink which concerns on 6th Embodiment of this invention. It is a bottom view explaining the outline of the heat sink which concerns on 7th Embodiment of this invention. It is a side view explaining the outline of the heat sink which concerns on 8th Embodiment of this invention. It is a side view explaining the outline of the heat sink which concerns on 9th Embodiment of this invention. It is a side view explaining the outline of the heat sink which concerns on 10th Embodiment of this invention.

Hereinafter, the heat sink according to the first embodiment of the present invention will be described in detail. FIG. 1 is a side view illustrating an outline of a heat sink according to a first embodiment of the present invention.

As shown in FIG. 1, the heat sink 1 according to the first embodiment of the present invention has two opposing plate-shaped bodies, that is, one plate-shaped body 11 and the other facing the one plate-shaped body 11. The cavity 13 through which the container 10 in which the cavity 13 is formed by overlapping the plate-shaped body 12, the working fluid (not shown) enclosed in the cavity 13, and the working fluid of the vapor phase flow. The steam flow path 15 provided in the above is provided. A vapor chamber 14 is formed by a container 10 having a hollow portion 13 formed therein, a working fluid, and a steam flow path 15.

The container 10 is a thin plate-shaped container, in which one plate-shaped body 11 has a first surface 21 which is a first main surface, and the other plate-shaped body 12 is a second main surface. It has two faces 22. Therefore, the container 10 has a first surface 21 which is a first main surface and a second surface 22 which is a second main surface facing the first surface 21.

The first surface 21 has a flat flat surface portion 32 and a convex portion 31 protruding outward from the flat surface portion 32. In the heat sink 1, one convex portion 31 is provided at the center of the first surface 21. Further, the side surface of the convex portion 31 protrudes in the vertical direction from the flat portion 32. On the other hand, the second surface 22 does not have a convex portion, and the entire second surface 22 is a flat flat portion. Since the first surface 21 has a flat surface portion 32 and a convex portion 31 protruding outward from the flat surface portion 32, the container 10 has a flat surface portion 17 and a convex portion 16 protruding outward from the flat surface portion 17. have. Therefore, the container 10 is provided with one convex portion 16 in the central portion of the first surface 21, and is not provided with the convex portion on the second surface 22. From the above, the flat surface portion 17 and the convex portion 16 of the container 10 are integrally molded. Further, the side surface of the convex portion 16 projects in the vertical direction from the flat surface portion 17.

Further, one plate-shaped body 11 has a side wall 23 erected along the peripheral edge of the first surface 21, and the other plate-shaped body 12 has a side wall 24 along the peripheral edge of the second surface 22. It is erected. By arranging the tip of the side wall 23 of one plate-shaped body 11 and the tip of the side wall 24 of the other plate-shaped body 12 so as to face each other and bringing them into contact with each other, a hollow portion 13 which is an internal space of the container 10 is formed. Therefore, the side surface of the container 10 is formed by the side wall 23 and the side wall 24. The cavity 13 is a closed space and is depressurized by a degassing process. The internal space of the convex portion 16 of the container 10 communicates with the internal space of the flat surface portion 17, and the hollow portion 13 of the container 10 is formed from the internal space of the convex portion 16 and the internal space of the flat surface portion 17. .. Therefore, the working fluid can flow between the internal space of the convex portion 16 and the internal space of the flat surface portion 17.

The shape of the container 10 is not particularly limited, but the heat sink 1 has a polygonal shape such as a quadrangular shape, a circular shape, or an ellipse in a plan view (a state in which the container 10 is visually recognized from the vertical direction with respect to the flat surface portion 17). Examples thereof include a shape, a shape having a straight portion and a curved portion, and the like.

In the heat sink 1, the first heat radiation fin 41 is erected on the outer surface of the flat surface portion 32 of the first surface 21, and the first heat radiation fin 41 is thermally connected to the container 10. A plurality of first heat radiation fins 41 are arranged in parallel at predetermined intervals along the extending direction of the plane portion 32. A plurality of the first heat radiation fins 41 are arranged in parallel to form the first heat radiation fin group 42. In the heat sink 1, the heights of the plurality of first heat radiating fins 41, 41, 41 ... Forming the first heat radiating fin group 42 are substantially the same. Further, the height of the first heat radiation fin 41 is equal to or less than the height of the convex portion 16. In the heat sink 1, the height of the first heat radiation fin 41 is lower than the height of the convex portion 16, and the tip of the first heat radiation fin 41 is the flat surface portion 17 of the container 10 rather than the tip of the convex portion 16. It is a mode that recedes in the direction.

On the other hand, the convex portion 16 of the container 10 is not provided with the heat radiation fins. The heat sink 1 is not provided with heat radiation fins on either the tip or the side surface of the convex portion 16. From the above, the plurality of first heat radiation fins 41, 41, 41 ... Are arranged from one end to the other end of the first surface 21 except for the convex portion 31 of the first surface 21.

As shown in FIG. 1, the convex portion 16 of the container 10 is a portion to which the heating element 100, which is a cooling element, is thermally connected, and functions as a heat receiving portion of the vapor chamber 14, that is, a heat receiving portion of the heat sink 1. do. The heating element 100 is thermally connected to the tip of the convex portion 16. From the above, the convex portion 16 has a heat receiving portion to which the heating element 100 is thermally connected, and the heat radiation fin is not provided at the tip of the convex portion 16 to which the heating element 100 is thermally connected. Examples of the heating element 100 include electronic components such as a central processing unit mounted on a wiring board (not shown). Since the tip of the first heat radiating fin 41 is located in the plane portion 17 direction of the container 10 with respect to the tip of the convex portion 16, even if the heating element 100 is mounted on the wiring board, the first heat radiating fin 41 The heating element 100 can be thermally connected to the tip of the convex portion 16 without being disturbed by the above.

The second surface 22 is not provided with a convex portion, and the entire surface is a flat surface. A second heat radiation fin 43 is erected on the outer surface of the second surface 22, and the second heat radiation fin 43 is thermally connected to the container 10. The second heat radiation fin 43 is erected on the outer surface of the second surface 22 so that the main surface of the second heat radiation fin 43 is substantially parallel to the main surface of the first heat radiation fin 41. Further, a plurality of the second heat radiation fins 43 are arranged in parallel at predetermined intervals along the extending direction of the second surface 22. A plurality of the second heat radiation fins 43 are arranged in parallel to form the second heat radiation fin group 44. In the heat sink 1, the heights of the plurality of second heat radiating fins 43, 43, 43 ... Forming the second heat radiating fin group 44 are all substantially the same. The plurality of second heat radiation fins 43, 43, 43 ... Are arranged from one end to the other end of the second surface 22.

From the above, in the container 10, the heat radiation fins are thermally connected only to the second surface 22, that is, only to one surface of the plate-shaped container 10 at the portion corresponding to the convex portion 16. Further, in the container 10, heat radiation fins are thermally connected to the first surface 21 and the second surface 22, that is, both sides of the plate-shaped container 10 at the portion corresponding to the flat surface portion 17. From the above, in the flat surface portion 17 of the container 10, the heat radiation fins are thermally connected to the container 10 in a manner divided into both surfaces of the container 10 (that is, the first surface 21 and the second surface 22). .. Therefore, in the flat surface portion 17 of the container 10, the fin area of the heat radiation fin is increased as compared with the convex portion 16. The portion of the container 10 to which the first heat radiating fin 41 and the second heat radiating fin 43 are thermally connected functions as a heat radiating portion of the vapor chamber 14, that is, a radiating portion of the heat sink 1.

The relationship between the height of the first heat radiating fin 41 and the height of the second heat radiating fin 43 can be appropriately selected depending on the installation environment of the heat sink 1, the amount of heat generated by the heating element 100, and the like. The height of the heat radiating fin 43 is higher than the height of the first heat radiating fin 41. Therefore, in the heat sink 1, the height of the second heat radiation fin group 44 is higher than the height of the first heat radiation fin group 42.

The cavity 13 of the container 10 is provided with a wick structure (not shown) that generates capillary force. The wick structure is provided, for example, over the entire container 10. Due to the capillary force of the wick structure, the working fluid whose phase has changed from the gas phase to the liquid phase in the heat radiation portion of the vapor chamber 14 returns from the heat radiation portion of the vapor chamber 14 to the heat receiving portion. The wick structure is not particularly limited, and for example, a sintered body of metal powder such as copper powder, a metal mesh made of metal wire, a non-woven fabric, a groove (plural number of fine grooves) formed on the inner surface of the container 10, and the like. Or a combination of them can be mentioned. Further, among the convex portions 16, a first wick structure having a large capillary force is provided as a wick structure at a heat receiving portion to which the heating element 100 is connected, that is, at the bottom of the convex portion 16, to prevent dryout. can. On the other hand, on a portion other than the bottom of the convex portion 16, for example, on the side surface of the convex portion 16 of the container 10, the flat surface portion 17 of the container 10 and the side surface of the container 10, the capillary force as a wick structure is higher than that of the first wick structure. By providing the small second wick structure, it is possible to reduce the flow path resistance when the working fluid of the liquid phase recirculates. When the wick structure is, for example, a sintered body of metal powder, the average primary particle size of the metal powder used as the raw material of the first wick structure is 50 μm or more and 100 μm or less, and the second wick structure is used. The average primary particle size of the metal powder used as a raw material for the body is 200 μm or more and 300 μm or less.

The steam flow path 15 is an internal space of the container 10 and extends over the entire container 10. Therefore, the working fluid of the gas phase can be circulated throughout the container 10 by the steam flow path 15. Further, the steam flow path 15 may be provided with pillars (columnar members) for maintaining the internal space of the container 10. The pillar is not particularly limited, but in order to reduce the flow path resistance when the working fluid of the liquid phase recirculates, for example, a wick structure is coated around a column-shaped metal member (for example, a copper member). Examples thereof include pillars of a composite material, sintered bodies of metal powder such as copper powder having a pillar shape, and the like.

Examples of the material of the container 10 include stainless steel, copper, copper alloy, aluminum, aluminum alloy, tin, tin alloy, titanium, titanium alloy, nickel, nickel alloy and the like. The materials of the first heat radiating fin 41 and the second heat radiating fin 43 are not particularly limited, and for example, a metal material such as copper, a copper alloy, aluminum, and an aluminum alloy, a carbon material such as graphite, and a composite using a carbon material are used. Members and the like can be mentioned.

The working fluid enclosed in the cavity 13 can be appropriately selected depending on the compatibility with the material of the container 10, and examples thereof include water, fluorocarbons, cyclopentane, ethylene glycol, and a mixture thereof. Can be done.

Further, the heat sink 1 may be forcibly air-cooled by a blower fan (not shown), if necessary. The cooling air from the blower fan is supplied along the main surfaces of the first heat radiation fin 41 and the second heat radiation fin 43 to cool the first heat radiation fin group 42 and the second heat radiation fin group 44. Will be done.

Next, the mechanism of the cooling function of the heat sink 1 will be described. First, the heating element 100, which is a cooling element, is thermally connected to the tip of the convex portion 16 of the container 10. When the container 10 receives heat from the heating element 100 at the convex portion 16, heat is transferred from the heating element 100 to the working fluid of the liquid phase of the cavity 13 at the convex portion 16 of the container 10, and the working fluid of the liquid phase is vaporized. The phase changes to the working fluid of the phase. The working fluid of the gas phase flows through the steam flow path 15 from the convex portion 16 of the container 10 to the flat surface portion 17, and diffuses over the entire flat surface portion 17. The working fluid of the gas phase diffuses from the convex portion 16 of the container 10 to the entire flat surface portion 17, so that the container 10 transports the heat from the heating element 100 from the convex portion 16 to the entire container 10 and the heating element 100. The heat from is diffused throughout the container 10. The working fluid of the gas phase that can be circulated throughout the container 10 releases latent heat by the heat exchange action of the first heat radiation fin group 42 and the second heat radiation fin group 44, and undergoes a phase change from the gas phase to the liquid phase. The released latent heat is transferred to the first heat radiation fin group 42 and the second heat radiation fin group 44 thermally connected to the container 10. The heat transferred from the container 10 to the first heat radiation fin group 42 and the second heat radiation fin group 44 is discharged to the external environment of the heat sink 1 via the first heat radiation fin group 42 and the second heat radiation fin group 44. Will be done. The working fluid that has released latent heat and changed its phase from the gas phase to the liquid phase is returned from the flat portion 17 of the container 10 to the convex portion 16 by the capillary force of the wick structure provided in the container 10, that is, the vapor chamber 14 It returns from the heat radiating part to the heat receiving part.

In the heat sink 1 according to the first embodiment of the present invention, the first surface 21 of the container 10 has a flat surface portion 32 and a convex portion 31 protruding outward from the flat surface portion 32, so that the container 10 has a flat surface portion 17. A second surface 21 having a convex portion 16 projecting outward from the flat surface portion 17 and having a first heat radiating fin 41 provided on the outer surface of the flat surface portion 17 and having a flat surface as a whole. By providing the second heat radiation fin 43 on the surface 22, it is possible to increase the fin area of the heat radiation fin while preventing the heat radiation efficiency of the first heat radiation fin 41 and the second heat radiation fin 43 from deteriorating. As a result, excellent cooling characteristics can be exhibited. That is, in the heat sink 1, the heat radiation fins are thermally connected to the container 10 in such a manner that the heat radiation fins are divided into the first heat radiation fin 41 and the second heat radiation fin 43 with the container 10 interposed therebetween. Even if the area is increased, it is possible to prevent the generation of a region that cannot sufficiently contribute to heat dissipation, and by extension, it is possible to prevent a decrease in heat dissipation efficiency of the heat dissipation fins.

Further, in the heat sink 1 according to the first embodiment of the present invention, the hollow portion 13 of the container 10 is formed by communicating the internal space of the convex portion 16 of the container 10 with the internal space of the flat surface portion 17. Therefore, since it is possible to prevent thermal resistance between the flat surface portion 17 of the container 10 that functions as a heat radiating portion and the convex portion 16 of the container 10 that functions as a heat receiving portion, it is possible to efficiently cool even a heating element 100 having a high calorific value. can.

Further, in the heat sink 1 according to the first embodiment of the present invention, the height of the second heat radiation fin 43 is higher than the height of the first heat radiation fin 41, so that the second heat radiation fin 43 is provided. When a space is formed on the second surface 22 side, the fin area of the heat radiating fin can be increased, so that excellent heat radiating characteristics can be exhibited.

Next, the heat sink according to the second embodiment of the present invention will be described in detail. FIG. 2 is a side view illustrating an outline of a heat sink according to a second embodiment of the present invention. Since the heat sink according to the second embodiment has the same main components as the heat sink according to the first embodiment, the same reference numerals are used for the same components as the heat sink according to the first embodiment. I will explain.

In the heat sink 1 according to the first embodiment, the container 10 is provided with one convex portion 16 at the center of the first surface 21, but instead, as shown in FIG. 2, a second In the heat sink 2 according to the embodiment, a plurality of convex portions 16 are provided on the first surface 21 of the container 10 in response to the existence of a plurality of heating elements 100 to be cooled. In the heat sink 2, two convex portions thermally connected to the heating elements 100-1 and 100-2, respectively, corresponding to the existence of the two heating elements 100-1 and 100-2 as objects to be cooled. 16-1 and 16-2 are provided.

The positions of the plurality of convex portions 16 can be appropriately selected depending on the usage conditions of the heat sink 2 and the arrangement of the plurality of heating elements 100, and in FIG. 2, for convenience of explanation, one is provided at both ends of the container 10. Each convex portion 16 is provided. Further, although not shown, in the heat sink 2, the two convex portions 16-1 and 16-2 are both provided at the central portion in the width direction of the container 10. Further, in the heat sink 2, the height of the convex portion 16-1 is the same as the height of the convex portion 16-2 corresponding to the same height of the heating elements 100-1 and 100-2. There is.

Even in the heat sink 2 in which the container 10 is provided with a plurality of convex portions 16 corresponding to the existence of a plurality of heating elements 100, the heat radiation fins are the first heat radiation fin 41 and the second heat radiation fin 43 with the container 10 interposed therebetween. Since it is thermally connected to the container 10 in a manner divided into the above, the fin area of the heat radiation fins is increased while preventing the heat radiation efficiency of the first heat radiation fin 41 and the second heat radiation fin 43 from being lowered. As a result, excellent heat dissipation characteristics can be exhibited.

Next, the heat sink according to the third embodiment of the present invention will be described in detail. FIG. 3 is a side view illustrating an outline of the heat sink according to the third embodiment of the present invention. Since the heat sink according to the third embodiment has the same main components as the heat sink according to the first and second embodiments, the same components are related to the first and second embodiments. It will be described using the same reference numerals as the heat sink.

In the heat sink 1 according to the first embodiment, one convex portion 16 is provided at the center of the first surface 21 of the container 10, but instead of this, as shown in FIG. 3, a third embodiment is provided. In the heat sink 3 according to the embodiment, one convex portion 16 is provided at the end of the first surface 21 of the container 10. As described above, the position of the convex portion 16 in the container 10 can be appropriately selected depending on the environment in which the heat sink 3 is installed, the arrangement of the heating element 100, and the like.

Even in the heat sink 3 in which the convex portion 16 is provided at the end of the container 10 in accordance with the arrangement of the heating element 100, the heat radiation fins are the first heat radiation fin 41 and the second heat radiation fin 43 with the container 10 interposed therebetween. Since it is thermally connected to the container 10 in a manner divided into the above, the fin area of the heat radiation fins is increased while preventing the heat radiation efficiency of the first heat radiation fin 41 and the second heat radiation fin 43 from being lowered. As a result, excellent heat dissipation characteristics can be exhibited.

Next, the heat sink according to the fourth embodiment of the present invention will be described in detail. FIG. 4 is a side view illustrating an outline of the heat sink according to the fourth embodiment of the present invention. Since the heat sink according to the fourth embodiment has the same main components as the heat sink according to the first to third embodiments, the same components are related to the first to third embodiments. It will be described using the same reference numerals as the heat sink.

In the heat sinks 1, 2 and 3 according to the first to third embodiments, the height of the second heat radiating fin 43 is higher than the height of the first heat radiating fin 41. As shown in FIG. 4, in the heat sink 4 according to the fourth embodiment, the height of the first heat radiation fin 41 is higher than the height of the second heat radiation fin 43. Therefore, in the heat sink 4, the height of the first heat radiation fin group 42 is higher than the height of the second heat radiation fin group 44. In the heat sink 4, since the height of the convex portion 16 is higher than the height of the convex portions 16 of the heat sinks 1, 2 and 3 according to the first to third embodiments, the height of the first heat radiation fin 41 is the first. The height is higher than the height of the heat radiating fin 43 of 2.

In the heat sink 4, when a relatively large space is formed on the first surface 21 side where the first heat radiation fin 41 is provided, that is, on the side where the heating element 100 is arranged, the first The fin area of the heat radiating fin can be increased by effectively utilizing the space on the surface 21 side. As described above, the height of the first heat radiating fin 41 and the height of the second heat radiating fin 43 can be appropriately selected depending on the surrounding layout, the supply direction of the cooling air, and the like.

Further, the height of the first heat radiation fin 41 may be the same as the height of the second heat radiation fin 43, and therefore, the first heat radiation fin 41 has a height equal to or higher than the height of the second heat radiation fin 43. You may be doing it.

Even in the heat sink 4 in which the first heat radiation fin 41 has a height equal to or higher than the height of the second heat radiation fin 43, the heat radiation fins sandwich the container 10 between the first heat radiation fin 41 and the second heat radiation fin 43. Since it is thermally connected to the container 10 in a manner divided into the above, the fin area of the heat radiation fins is increased while preventing the heat radiation efficiency of the first heat radiation fin 41 and the second heat radiation fin 43 from being lowered. As a result, excellent heat dissipation characteristics can be exhibited.

Next, the heat sink according to the fifth embodiment of the present invention will be described in detail. FIG. 5 is a side view illustrating an outline of the heat sink according to the fifth embodiment of the present invention. Since the heat sink according to the fifth embodiment has the same main components as the heat sink according to the first to fourth embodiments, the same components are related to the first to fourth embodiments. It will be described using the same reference numerals as the heat sink.

As shown in FIG. 5, in the heat sink 5 according to the fifth embodiment, the convex portion 16 has a step portion 50, and a third heat radiation fin 51 is further erected on the outer surface 53 of the step portion 50. There is. The third heat radiating fin 51 is erected on the outer surface 53 of the stepped portion 50 facing the heating element 100 so that the main surface of the third heat radiating fin 51 is substantially parallel to the main surface of the first heat radiating fin 41. Has been done. In the third heat radiation fin 51, a plurality of third heat radiation fins 51, 51, 51 ... Are arranged in parallel along the outer surface 53 of the stepped portion 50 to form the third heat radiation fin group 52. There is. The heights of the plurality of third heat radiation fins 51, 51, 51 ... Are all substantially the same.

The tip of the third heat radiation fin 51 is recessed from the tip of the convex portion 16 in the direction of the flat surface portion 17 of the container 10. Further, the tip of the third heat radiation fin 51 is located on substantially the same plane as the tip of the first heat radiation fin 41.

In the heat sink 5, of the convex portions 16, the stepped portion 50 on which the third heat radiating fin 51 is erected functions as a heat radiating portion. Therefore, the convex portion 16 has a heat receiving portion to which the heating element 100 is thermally connected at the tip thereof and a heat radiating portion to which the third heat radiating fin 51 is thermally connected.

In the heat sink 5, the convex portion 16 has the stepped portion 50, and the outer surface 53 of the stepped portion 50 is further provided with the third heat radiation fin 51, so that the convex portion 16 is connected to the container 10 while having the convex portion 16. Since the number of heat-dissipating fins can be further increased, the heat-dissipating characteristics are further improved. Further, in the heat sink 5, the heat from the heating element 100 can be diffused in advance in the surface direction of the container 10 at the convex portion 16 having the stepped portion 50, so that the heat load of the vapor chamber 14 can be reduced. ..

Even in the heat sink 5 in which the convex portion 16 has the stepped portion 50 and the third heat radiating fin 51 is provided on the outer surface 53 of the stepped portion 50, the heat radiating fins sandwich the container 10 with the first heat radiating fins 41 and the second heat radiating fins 41. Since it is thermally connected to the container 10 in a manner divided into the heat radiating fins 43 of the above, the fin area of the heat radiating fins is prevented from being lowered in the heat radiating efficiency of the first heat radiating fins 41 and the second heat radiating fins 43. As a result, excellent heat dissipation characteristics can be exhibited.

Next, the heat sink according to the sixth embodiment of the present invention will be described in detail. FIG. 6 is a side view illustrating an outline of the heat sink according to the sixth embodiment of the present invention. Since the heat sink according to the sixth embodiment has the same main components as the heat sink according to the first to fifth embodiments, the same components are related to the first to fifth embodiments. It will be described using the same reference numerals as the heat sink.

In the heat sinks 1, 2 and 3 according to the first to third embodiments, the side surface of the convex portion 16 protrudes in the vertical direction from the flat surface portion 17, but instead, as shown in FIG. 6, the sixth In the heat sink 6 according to the embodiment, the side surface of the convex portion 16 projects in an oblique direction from the flat surface portion 17, and the side surface of the convex portion 16 becomes an inclined portion 60 whose width becomes narrower toward the tip of the convex portion 16. ing. Further, a fourth heat radiation fin 61 is erected on the outer surface 63 of the inclined portion 60 forming the side surface of the convex portion 16. The fourth heat radiation fin 61 is erected on the outer surface 63 of the inclined portion 60 so that the main surface of the fourth heat radiation fin 61 is substantially parallel to the main surface of the first heat radiation fin 41.

In the fourth heat radiation fin 61, a plurality of fourth heat radiation fins 61, 61, 61 ... Are arranged in parallel along the outer surface 63 of the inclined portion 60 to form the fourth heat radiation fin group 62. There is. The tip of the fourth heat radiation fin 61 is recessed from the tip of the convex portion 16 in the direction of the flat surface portion 17 of the container 10. Further, the tip of the fourth heat radiation fin 61 is located on substantially the same plane as the tip of the first heat radiation fin 41. Therefore, the height of the fourth heat radiation fin 61 is different depending on the position of the thermally connected inclined portion 60.

In the heat sink 6, of the convex portions 16, the inclined portion 60 on which the fourth heat radiating fin 61 is erected functions as a heat radiating portion. Therefore, the convex portion 16 has a heat receiving portion to which the heating element 100 is thermally connected at the tip thereof and a heat radiating portion to which the fourth heat radiating fin 61 is thermally connected.

In the heat sink 6, the side surface of the convex portion 16 has an inclined portion 60 whose width becomes narrower toward the tip of the convex portion 16, and a fourth heat radiation fin 61 is further provided on the outer surface 63 of the inclined portion 60. As a result, the number of heat-dissipating fins connected to the container 10 while having the convex portion 16 can be further increased, so that the heat-dissipating characteristics are further improved. Further, in the heat sink 6, the heat from the heating element 100 can be diffused in advance in the surface direction of the container 10 at the convex portion 16 having the inclined portion 60, so that the heat load of the vapor chamber 14 can be reduced. ..

Even in the heat sink 6 in which the convex portion 16 has the inclined portion 60 and the fourth heat radiation fin 61 is provided on the outer surface 63 of the inclined portion 60, the heat radiation fins sandwich the container 10 with the first heat radiation fin 41 and the second heat radiation fin 61. Since it is thermally connected to the container 10 in a manner divided into the heat radiation fins 43 of the above, the fin area of the heat radiation fins is prevented from being lowered in the heat radiation efficiency of the first heat radiation fin 41 and the second heat radiation fin 43. As a result, excellent heat dissipation characteristics can be exhibited.

Next, the heat sink according to the seventh embodiment of the present invention will be described in detail. FIG. 7 is a bottom view illustrating an outline of the heat sink according to the seventh embodiment of the present invention. Since the heat sink according to the 7th embodiment has the same main components as the heat sink according to the 1st to 6th embodiments, the same components are related to the 1st to 6th embodiments. It will be described using the same reference numerals as the heat sink.

In the heat sink 2 according to the second embodiment, the two convex portions 16-1 and 16-2 are both provided in the central portion in the width direction of the container 10, but instead of this, they are shown in FIG. As described above, in the heat sink 7 according to the seventh embodiment, the convex portion 16-1 is at one end 70 in the width direction W of the container 10, and the convex portion 16-2 is at the other end 71 of the width direction W of the container 10, respectively. It is provided.

In the heat sink 7, the two protrusions 16-1 and 16-2 are provided at different positions with respect to the width direction W of the container 10, so that the cooling air is directed in the direction orthogonal to the width direction W of the container 10. Even when supplied from, sufficient cooling air is supplied to the convex portion 16-1 thermally connected to the heating element 100-1 and the convex portion 16-2 thermally connected to the heating element 100-2. can do. Further, also in the heat sink 7, since the heat radiating fins are thermally connected to the container 10 in a manner of being divided into the first heat radiating fins 41 and the second heat radiating fins 43 with the container 10 interposed therebetween, the first heat radiating fins. The fin area of the heat dissipation fins can be increased while preventing the heat dissipation efficiency of the 41 and the second heat dissipation fin 43 from being lowered, and as a result, excellent heat dissipation characteristics can be exhibited.

Next, the heat sink according to the eighth embodiment of the present invention will be described in detail. FIG. 8 is a side view illustrating an outline of the heat sink according to the eighth embodiment of the present invention. Since the heat sink according to the eighth embodiment has the same main components as the heat sink according to the first to seventh embodiments, the same components are related to the first to seventh embodiments. It will be described using the same reference numerals as the heat sink.

In the heat sink 2 according to the second embodiment, the heights of the plurality of convex portions 16 are the same, that is, the heights of the convex portions 16-1 are the same as the heights of the convex portions 16-2. Instead, as shown in FIG. 8, in the heat sink 8 according to the eighth embodiment, the heights of the plurality of convex portions 16 are different heights. In the heat sink 8, the height of the convex portion 16-1 is higher than the height of the convex portion 16-2 corresponding to the height of the heating element 100-1 being lower than the height of the heating element 100-2. There is. As described above, the height of the plurality of convex portions 16 can be appropriately selected depending on the height of the plurality of heating elements 100 to which the heat sink 8 is thermally connected and the like.

The heat sink 8 is excellent in thermal connectivity to each heating element 100 even if the heights of the plurality of heating elements 100 are different. Further, also in the heat sink 8, since the heat radiating fins are thermally connected to the container 10 in a manner of being divided into the first heat radiating fins 41 and the second heat radiating fins 43 with the container 10 interposed therebetween, the first heat radiating fins. The fin area of the heat dissipation fins can be increased while preventing the heat dissipation efficiency of the 41 and the second heat dissipation fin 43 from being lowered, and as a result, excellent heat dissipation characteristics can be exhibited.

Next, the heat sink according to the ninth embodiment of the present invention will be described in detail. FIG. 9 is a side view illustrating an outline of the heat sink according to the ninth embodiment of the present invention. Since the heat sink according to the ninth embodiment has the same main components as the heat sink according to the first to eighth embodiments, the same components are related to the first to eighth embodiments. It will be described using the same reference numerals as the heat sink.

In the heat sink 1 according to the first embodiment, the second surface 22 does not have a convex portion, the entire second surface 22 is a flat flat portion, and the first surface 21 is a flat portion. By having the 32 and the convex portion 31 protruding outward from the flat surface portion 32, the container 10 had the flat surface portion 17 and the convex portion 16 protruding outward from the flat surface portion 17. Instead, as shown in FIG. 9, in the heat sink 9 according to the ninth embodiment, the first surface 21 has a flat surface portion 32 and a convex portion 31 protruding outward from the flat surface portion 32. Since the surface 22 of 2 has a flat surface portion 82 and a convex portion 81 protruding outward from the flat surface portion 82, the container 10 has the flat surface portion 17 and the convex portions 16 and 86 protruding outward from the flat surface portion 17. have.

Therefore, the container 10 is provided with the convex portion 16 on the first surface 21 and the convex portion 86 on the second surface 22. For convenience of explanation, in the heat sink 9, one convex portion 16 is provided at one end of the first surface 21, and one convex portion 86 is provided at the other end of the second surface 22.

In the heat sink 9, as in the heat sink 1 according to the first embodiment, the convex portion 16 provided on the first surface 21 is not provided with the heat radiation fins. Neither the heat sink 9 nor the tip or side surface of the convex portion 16 is provided with heat radiation fins. From the above, the plurality of first heat radiation fins 41, 41, 41 ... Are arranged from one end to the other end of the first surface 21 except for the convex portion 31 of the first surface 21. On the other hand, in the heat sink 9, the convex portion 86 is provided on the second surface 22, and the convex portion 86 is not provided with the heat radiation fin. The heat sink 9 is not provided with heat radiation fins on either the tip or the side surface of the convex portion 86. From the above, the plurality of second heat radiation fins 43, 43, 43 ... Are arranged from one end to the other end of the second surface 22 except for the convex portion 81 of the second surface 22.

From the above, in the container 10, the heat radiation fins are thermally connected only to the second surface 22, that is, only to one surface of the plate-shaped container 10 at the portion corresponding to the convex portion 16. Further, in the portion corresponding to the convex portion 86, the heat radiation fins are thermally connected only to the first surface 21, that is, only to one surface of the plate-shaped container 10. Further, the container 10 has heat radiation fins on both sides of the first surface 21 and the second surface 22, that is, the plate-shaped container 10 in the portion corresponding to the flat surface portion 17, which is a portion other than the convex portions 16 and 86. Are thermally connected.

As described above, depending on the environment in which the heat sink 9 is installed, the arrangement of the heating element 100, and the like, not only the convex portion 16 is provided on the first surface 21 of the container 10, but also the convex portion 86 is further provided on the second surface 22. May be provided. Even in the heat sink 9, since the heat radiating fins are thermally connected to the container 10 in a manner of being divided into the first heat radiating fins 41 and the second heat radiating fins 43 with the container 10 interposed therebetween, the heat radiating fins 41 and the first heat radiating fins 41. It is possible to increase the fin area of the heat radiating fin while preventing the second heat radiating fin 43 from deteriorating the heat radiating efficiency, and as a result, excellent heat radiating characteristics can be exhibited.

Next, the heat sink according to the tenth embodiment of the present invention will be described in detail. FIG. 10 is a side view illustrating an outline of the heat sink according to the tenth embodiment of the present invention. Since the heat sink according to the tenth embodiment has the same main components as the heat sink according to the first to ninth embodiments, the same components are related to the first to ninth embodiments. It will be described using the same reference numerals as the heat sink.

As shown in FIG. 10, in the heat sink 10 according to the tenth embodiment, the flat surface portion 17 of the container 10 is provided with a step 83 in the thickness direction of the container 10. Therefore, in the heat sink 10, the flat surface portion 17 of the container 10 is a multi-stage flat surface portion in which the flat surface is formed in multiple stages. The flat surface portion 17 of the container 10 has a first portion 84 in which the cavity portion 13 is relatively thick and a second portion 85 in which the cavity portion 13 is relatively thin due to the provision of the step 83. In the heat sink 10, a step 83-1 is formed on the flat surface portion 32 of the first surface 21, and a step 83-2 is formed on the second surface 22 on which the convex portion is not provided. The flat surface portion 17 of the container 10 has a first portion 84 between the step 83-1 and the step 83-2.

Further, the first heat radiation fin 41 is provided in the first portion 84 and the second portion 85, and the second heat radiation fin 43 is provided in the first portion 84 and the second portion 85.

Even in the heat sink 10, a first portion 84 in which the cavity portion 13 is relatively thick and a second portion 85 in which the cavity portion 13 is relatively thin are formed on the flat surface portion 17 of the container 10 to which the heat radiation fins are thermally connected. Since the heat radiating fins are thermally connected to the container 10 in such a manner that the heat radiating fins are divided into the first radiating fins 41 and the second radiating fins 43 with the container 10 interposed therebetween, the first radiating fins 41 and the second radiating fins 41 The fin area of the heat dissipation fins can be increased while preventing the heat dissipation efficiency of the heat dissipation fins 43 from being lowered, and as a result, excellent heat dissipation characteristics can be exhibited.

Next, another embodiment of the present invention will be described. In the heat sink of each of the above embodiments, the first heat radiation fins are arranged from one end to the other end of the first surface except for the convex portion, and the second heat radiation fins are arranged from one end to the other end of the second surface. However, instead of this, the first heat radiating fin may be provided only in a part of the first surface excluding the convex portion, and the second heat radiating fin may be provided on the second surface. It may be provided only in a part of the area of. Further, in the heat sink of each of the above embodiments, the first heat radiation fin and the second heat radiation fin are erected so that the main surface of the first heat radiation fin and the main surface of the second heat radiation fin are substantially parallel to each other. However, depending on the usage conditions of the heat sink, the first heat radiation fin and the second heat radiation fin are provided so that the main surface of the first heat radiation fin and the main surface of the second heat radiation fin are not parallel to each other. It may be erected.

Further, among the hollow portions of the container, fins for increasing the surface area inside the container (container inner surface surface area increasing fins) may be provided in the convex portions, if necessary. By providing fins for increasing the surface area of the inner surface of the container on the convex portion, the phase change of the working fluid from the liquid phase to the gas phase is promoted, and the heat transport characteristics of the vapor chamber are further improved.

The heat sink of the present invention can exhibit excellent cooling characteristics by increasing the fin area of the heat dissipation fins while preventing the heat dissipation efficiency of the heat dissipation fins from being lowered, so that it can be used in a narrow space such as an electronic component mounted on a server. It has high utility value in the field of cooling installed electronic components with high calorific value.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Heat sink 10 Container 11 One plate 12 12 The other plate 13 Cavity 14 Vapor chamber 15 Steam flow path 16, 86 Convex 17 Flat surface 21 First surface 22 Second surface 41 First heat dissipation fin 43 Second heat dissipation fin

Claims (11)

A container having a first surface and a second surface facing the first surface having a cavity formed inside, a working fluid enclosed in the cavity, and the working fluid of the vapor phase flow. With a steam flow path provided in the cavity,
The first surface has a flat surface portion and a convex portion protruding outward from the flat surface portion, whereby the container has a flat surface portion and a convex portion protruding outward from the flat surface portion.
The hollow portion is formed by communicating the internal space of the convex portion of the container with the internal space of the flat surface portion.
Of the first surface, the first heat radiation fin is provided on the outer surface of the flat surface portion, and the second heat radiation fin is provided on the outer surface of the second surface.
A heat sink in which the convex portion is provided at a central portion, one end and / or the other end in the width direction of the container . A container having a first surface and a second surface facing the first surface having a cavity formed inside, a working fluid enclosed in the cavity, and the working fluid of the vapor phase flow. With a steam flow path provided in the cavity,
The first surface has a flat surface portion and a convex portion protruding outward from the flat surface portion, and the second surface has a flat surface portion and a convex portion protruding outward from the flat surface portion. , The container has a flat surface portion and a convex portion protruding outward from the flat surface portion.
The hollow portion is formed by communicating the internal space of the convex portion of the container with the internal space of the flat surface portion.
A heat sink in which a first heat radiation fin is provided on the outer surface of the flat surface portion of the first surface, and a second heat radiation fin is provided on the outer surface of the flat surface portion of the second surface. According to claim 1, the container is formed by one plate-shaped body and the other plate-shaped body facing the one plate-shaped body, and the one plate-shaped body has a convex portion protruding outward. The heat sink described. The container is formed by one plate-shaped body and the other plate-shaped body facing the one plate-shaped body, and the one plate-shaped body and the other plate-shaped body are convex outward. The heat sink according to claim 2, which has a portion. According to any one of claims 1 to 4, the convex portion has a heat receiving portion to which a heating element to be cooled is thermally connected, and a heat radiating fin is not provided at the tip of the convex portion. The heat sink described. The heat sink according to any one of claims 1 to 5, wherein the convex portion has a stepped portion, and a third heat radiation fin is further provided on the outer surface of the stepped portion. Any of claims 1 to 6, wherein the side surface of the convex portion has an inclined portion whose width becomes narrower toward the tip of the convex portion, and a fourth heat radiating fin is further provided on the outer surface of the inclined portion. Or the heat sink according to item 1. The heat sink according to any one of claims 1 to 7, wherein the convex portion is provided. The heat sink according to any one of claims 1 to 7, wherein a plurality of the convex portions are provided. The heat sink according to any one of claims 1 to 9, wherein a step is provided on a flat surface portion of the container. The heat sink according to any one of claims 1 to 10, wherein a wick structure is provided in the hollow portion over the entire container.

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